What is the purpose of a human-machine interface (HMI)?

The purpose of a human-machine interface (HMI) is primarily to create graphical interfaces for process control. HMIs serve as a critical link between operators and the machinery or processes they control. By presenting process data through graphical elements, such as visual displays and interactive controls, an HMI enables operators to monitor, manage, and adjust operations efficiently.

This functionality allows users to visualize complex data in an understandable format, making it easier for them to make informed decisions based on the current status of the system. The graphical representation typically includes features like charts, alarms, and control buttons, facilitating an intuitive interaction that improves response times and operational safety.

In contrast, although automated algorithms, real-time data logging, and network security are important elements within industrial systems, they are not the primary role of an HMI. Automated algorithms may be developed independent of the HMI, data logging typically pertains to systems that record information for analysis or compliance, and while network security is crucial for protecting systems, it does not relate directly to the human-machine interface's intended functions.